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CSS has several different units for expressing a length. Many CSS properties take "length" values, such as width , margin , padding , font-size , etc. Length is a number followed by a length unit, such as 10px , 2em , etc.
- em, px, pt, cm, in… CSS offers a number of different units for expressing length. Some have their history in typography, such as point (pt) and pica (pc), others are known from everyday use, such as centimeter (cm) and inch (in).
- Use em or px for font sizes. CSS inherited the units pt(point) and pc(pica) from typography. Printers have traditionally used those and similar units in preference to cmor in.
- More units in CSS. To make it even easier to write style rules that depend only on the default font size, CSS has since 2013 a new unit: the rem. The rem(for “root em”) is the font size of the root element of the document.
- Site navigation. CSS home. Learn & use. Software. Participate / drafts. Bert Bos, style activity lead. Copyright © 1994–2021 W3C Privacy policy. Created 12 Jan 2010;
Apr 3, 2024 · Relative length units are relative to something else. For example: em and rem are relative to the font size of the parent element and the root element, respectively. vh and vw are relative to the viewport's height and width, respectively.
Jan 25, 2024 · This article will demonstrate the best use cases for each of these units. We'll focus on the most important and frequently used CSS units here: rem, em, vh, vw, %, and the all too familiar absolute unit – px.
Feb 3, 2020 · Here are some common relative length units: em. The CSS em unit gets its name from a typographical unit. In typography, the term em "was originally a reference to the width of the capital M in the typeface and size being used". When used with the font-size property, em inherits the font-size from its parent element:
Feb 17, 2023 · In CSS, em is a unit of measurement for specifying font size. Unlike absolute units such as pixels or points, em is a relative unit that is based on the size of the parent element's font. If the parent element has a font size of 16 pixels, then 1em is equal to 16 pixels.
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3 days ago · We need units in CSS because they determine how to size elements on a page, whether it’s the height of a box, the width of an image, the font-size of a heading, the margin between two elements, how long an animation runs, etc. Without them, the browser would have no way of knowing how to apply numbers to an element.
